Mendel’s Gardens

Helianthemum ledifolium

Spotted Rock Rose

Family CistaceaeGenus Helianthemum

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

Start around March 29, 2027 for a May 3 last frost.

  1. Warm moist stratification

    Temperature: 70°F 21°C

    30% germinated here, in 3-7 days.

  2. Cold moist stratification

    Temperature: 40°F 4°C

  3. Warm moist stratification

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 7 days to germinate.

30% germination in 3–7 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, HelianthemumPublic domain
Show the original text
Helianthemum (Cistaceae). H. ledifolium germ.70(30% in 3-7 d)-40-70 and 40(16% in 4-11 w)-70(5%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Helianthemum. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around January 18, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Temperature: 40°F 4°C

    16% germinated at 40 itself, in 4-11 weeks.

  2. Warm moist stratification

    Temperature: 70°F 21°C

    A further 5% after the move.

No stated waiting before sowing. Then 77 days to germinate.

16% germination in 28–77 days.

Half the germination of sowing straight at 70, and months slower.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, HelianthemumPublic domain
Show the original text
Helianthemum (Cistaceae). H. ledifolium germ.70(30% in 3-7 d)-40-70 and 40(16% in 4-11 w)-70(5%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Helianthemum. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.